Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
  • F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
  • F16B13/12—Separate metal or non-separate or non-metal dowel sleeves fastened by inserting the screw, nail or the like

Definitions

• the present invention relates to a fastening device for use with Light— r- ⁇ weight concrete and other porous material, and it includes a substan ⁇ tially tubular part, which is partially slit up longitudinally from a
• the present invention has the object of eliminating the above-mentioned problems, by providing a cheap and reliable fastening device, with an 25 expansion suited the properties of lightweight concrete and which is retained even when the fastening device is subjected to pull-out stresses. What hereby characterizes the invention will be seen from the following claims.
• FIG. 1 is a side view of a fastening device
• Figure 2 illustrates the same device in cross-section
• Figure 3 is a perspective view of an expansion part.
• Figure 4 is a perspective view of an expanded fastening device and Figure 5 illustrates an example of a means intended to increase the capacity of the device to take up transverse forces.
• the fastening device illustrated in Figures 1 and 2 comprises a tubular part 1, produced by rolling a plate into a tubular shape. From a for- ward insertion end 6, the tubular part is longitudinally bifurcated to form two Limbs 3 and 4. Inside the tubular part 1 there is dis ⁇ posed an expansion part 2, seen in perspective in Figure 3.
• This part comprises an elongate plate, folded such that it is given a substan- tially U-shaped cross-section. In its lower portion the expansion part is formed with a tongue 5, intended for interfering coaction with a hole 8, disposed above an inward bend in the Limb 4, adjacent the in ⁇ sertion end.
• a weakened zone or bending notch 9 separating the expansion part into first and second respective elongate portions 11 and 16, the part being slightly bent at said weakened zone.
• the latter functions, together with the tongue 5 accommodated in the hole 8, as a hinge on expansion of the device.
• the tubular part 1 is provided with a collar " JO, and with means 7 intended for coaction with a screw or the like.
• this means comprises a plurality of dia ⁇ metrically opposing impressions forming an internal thread suited to a coach screw or the Like.
• the device may be driven into the material without preparatory drilling.
• the device When the collar 10 is flush with the concrete surface, the device is expanded by the end 15 of the expansion part being pressed or knocked into the device, to bend along the binding notch 9, while the first elongate portion 11 of said part is caused to fill a position substantially across the tubular part, the limbs 3 and 4 being forced apart,! as illustrated in Figure 4.
• the portion 16 of the expansion part will thus fill a position with the end 15 against the limb 4, thus preventing the return of the expansion part to its initial situation.
• the expansion part may be pressed home with the aid of a screw or other means coacting with the means 10.
• the expansion part may also be driven into the device with t e' aid of a punch implemented such that the expansion part cannot be driven past the position of maximum expansion of the Limbs 3 and 4.
• a supporting washer, or the Like support, is placed under the collar 10 of the device on driving in the expansion part,to prevent the the whole device from sinking into the concrete.
• FIG. 5 is a cross-section of a suitable implementation of a supporting washerfor the case where the device is intended to take up transverse forces.
• the washer 12 having a central impression complemental to the collar 10, has been given a dished shape by pressing down the edge portion 13. This portion is intended for driving " into the lightweight concrete to increase the bearing area of the device for transverse forces.
• the hole edges of the washer may be suitably drawn down into a locating sleeve 14, for facilitating correct assembly of the device with said washer.
• OMPI up to twice that of a fLat washer having an area corresponding to the projected area of the expanded device.
• a further advantage of the cushion formation is that the device sits solidly in the concrete when unloaded, and also for normal Loads, i. e. such as do not result in pulling out.
• Many known types of fasteners for ' lightweight concrete are surrounded by such having its original cellu ⁇ lar structure. When the fastener is loaded this structure is crushed with the formation of Load distributing cushions in the direction of withdrawal, but this first occurs in conjunction with a certain amount of withdrawal of the fastener, which thereby does not sit solidly in the concrete. If the load on the fastener is intermittent, there is a risk of the fastener coming Loose altogether, a Little at a time, and this risk is entirely eliminated in the fastening device in accordance with the present invention.
• the increased initial resistance to with- drawaL which is achieved by the cushion formation, reaches and optimum at a certain degree of expansion, which is dependent of the proportions of the fastening device.
• the Length of the Limbs 3 and 4 ought to be between 5 to 10 times the diameter of the tubular part 1. It is a special advantage if the Length of the Limbs is between 6 to 8 times said diameter.
• the insertion end is expan ⁇ ded to a transverse dimension of 2 to 3 times the diameter of the tu ⁇ bular part.
• the length of the limbs is 6 to 8 times said diameter it is a special advantage if the insertion end is expanded to a trans- verse dimension of 2,1-2,5 times said diamter.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Joining Of Building Structures In Genera (AREA)
• Dowels (AREA)
• Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20345794

Family Applications (1)

Country Status (8)

Cited By (1)

Citations (2)

Family Cites Families (4)

• 1982
  • 1982-01-21 SE SE8200332A patent/SE429467B/sv not_active IP Right Cessation
• 1983
  • 1983-01-18 JP JP50047883A patent/JPS59500108A/ja active Pending
  • 1983-01-18 EP EP83900444A patent/EP0098859B1/en not_active Expired
  • 1983-01-18 DE DE8383900444T patent/DE3371552D1/de not_active Expired
  • 1983-01-18 WO PCT/SE1983/000008 patent/WO1983002648A1/en active IP Right Grant
  • 1983-01-20 YU YU11883A patent/YU11883A/xx unknown
  • 1983-09-05 FI FI833156A patent/FI70986C/sv not_active IP Right Cessation
  • 1983-09-20 DK DK428983A patent/DK149905C/da not_active IP Right Cessation

Patent Citations (2)

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